System or device, Application layer, Transmission mode for application data – ProSoft Technology 5201-DFNT-104S User Manual
Page 128: Common address of asdu, Information object address, Cause of transmission, Length of apdu
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Protocol Manual
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ProSoft Technology, Inc.
March 19, 2010
A black check box indicates that the option cannot be selected in this companion
standard.
5.7.1 System or device
System definition
Controlling station definition (Master)
⌧ Controlled station definition (Slave)
5.7.2 Application Layer
Transmission mode for application data
Mode 1 (Least significant octet first), as defined in clause 4.10 of IEC 60870-5-4,
is used exclusively in this companion standard.
Common Address of ASDU
(System-specific parameter)
One octet
⌧ Two octets
Information object address
(System-specific parameter)
One octet
Structured
Two octets
Unstructured
⌧ Three octets
Cause of transmission
(System-specific parameter)
One octet
⌧ Two octets (with originator address)
Length of APDU
(System-specific parameter, specify the maximum length of the APDU per
system)
The Maximum length of the APDU is 246 (default). The maximum length may be
reduced by the system.
246 Maximum length of APDU per system